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# modbus_write_registers
## Name
modbus_write_registers - write many registers
## Synopsis
```c
int modbus_write_registers(modbus_t *ctx, int addr, int nb, const uint16_t *src);
```
## Description
The *modbus_write_registers()* function shall write the content of the `nb`
holding registers from the array `src` at address `addr` of the remote device.
The function uses the Modbus function code 0x10 (preset multiple registers).
## Return value
The function shall return the number of written registers if
successful. Otherwise it shall return -1 and set errno.
## See also
- [modbus_write_register](modbus_write_register.md)
- [modbus_read_registers](modbus_read_registers.md)
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